Water tank for use with a solar air conditioning system

ABSTRACT

A water tank for use in air-conditioning and/or heating systems and includes a container capable of storing at least one thousand gallons of a fluid. An evaporator coil is disposed within the container and the fluid contained within the container. The evaporator can consist as part of a refrigerant circuit. A pickup radiator coil is also disposed within the container and fluid. The pickup radiator coil can consist as part of a chilled water air conditioning water system for a dwelling. The water tank can be insulated. The fluid stored within said container can be a mixture of water and anti-freeze.

This application is a continuation of U.S. application Ser. No.12/249,071, filed Oct. 10, 2008, which is a continuation-in-part of U.S.application Ser. No. 11/671,547, filed Feb. 6, 2007, which claims thebenefit of and priority to U.S. Application Ser. No. 60/853,531, filedOct. 23, 2006. All applications are incorporated by reference in theirentireties as if fully set forth herein.

1. FIELD OF THE INVENTION

The present invention relates generally to air conditioning systems andparticularly to a solar air conditioning system.

2. BACKGROUND OF THE INVENTION

High electricity bills from air conditioning and/or heating use for adwelling are common and reoccurring. Additionally, the manufacture ofenergy at a power plant causes pollution to be released in the air.Furthermore, electricity availability in undeveloped countries, as wellas remote locations in developed countries, may be scarce, on limitedbasis or often non-existent. As a result, these locations are unable tostore foods and liquids requiring refrigeration due to the lack ofelectricity. For undeveloped countries the lack of electricity is afactor in the poverty, hunger and lack of nourishment for its citizens.It is to these problems that the present invention is directed.

SUMMARY OF THE INVENTION

The present invention generally provide a solar air-conditioning systemthat is preferably designed to operate with concentrated solar heatsupplemented with solar electric cells/battery and if necessary, powerfrom an electric utility grid. The unit of heat added or subtracted is aBritish Thermal Unit (“BTU”), which is defined as the amount of heat toraise one pound of water one (1°) degree Fahrenheit. With excesscapacity preferably designed in, unused BTUs can go into reserve fornight and cloudy days. The present invention system can use acirculating refrigerant such as, but not limited to, Freon or ammonia ina cycle of compression and expansion. Solar concentrators can raisetemperature and pressure of the refrigerant. The raised temperature canbe dissipated to the atmosphere and the refrigerant proceeds to theevaporator coil. The evaporator can be located within a water tankcontaining an anti-freeze water solution. Preferably, the water tankcontains at least approximately 1000 gallons of the anti-freeze watersolution. The water is preferably the storage medium. Heat can be addedto or extracted from the storage medium by the evaporator coil.

Preferably, also within the water tank can be a radiator type pickupcoil. The pickup coil can be part of a separate chilled water systemwhich can circulate its own water supply through radiators locatedthroughout a building, dwelling, house, etc. (all collectively referredto as “dwelling”). The temperature within this separate system can bethe temperature of the water within the tank by simple conduction.

The refrigerant system can include a supplemental compressor which canbe electrically driven from one or more, and preferably a plurality orbank of, solar electric cells or the power grid. The refrigerant systemcan also include one way direction positive displacement rotary valveswhich can serve to insure proper gas direction and can also provide amechanical link to the energy in the refrigerant circuit. Thismechanical link can be used to power a generator or a fluid pump. Whenin solar heat mode, certain bypass valves within the refrigerant systemallow switching to solar heating. When in this mode the generator may beelectrically switched to function as a motor to assist the circulationof the refrigerant.

The present invention can also be used for or applicable to large areacoolers or refrigerators and provides a device which can providerefrigeration to areas where electricity is not present or available.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic/flow diagram of a first embodiment for the presentinvention system;

FIG. 2 is schematic/flow diagram of a portion of a second embodiment forthe present invention system;

FIG. 3 is schematic/flow diagram of a portion of a third embodiment forthe present invention system;

FIG. 4 is a detailed view of one bypass valve (which is used whenswitching to solar heat mode) that can be used in accordance with thepresent invention system;

FIG. 5 is a schematic of a first embodiment for an expansion valve thatcan be used in accordance with the present invention system;

FIG. 6 is a schematic of a second embodiment for the expansion valve inaccordance with the present invention system;

FIG. 7 is a schematic of a third embodiment for the expansion valve inaccordance with the present invention system;

FIG. 8 is a diagram for allowing a condenser coil of the presentinvention system to dissipate heat to water circulated over its surface;

FIG. 9 is a perspective view of a solar concentrator which can be usedwith the present invention system;

FIG. 10 is a perspective view of rotary valve that can be used with thepresent invention system;

FIG. 11 is a perspective view of the inner cylinder for the rotary valveof FIG. 10;

FIGS. 12 through 16 illustrated alternative concentrators that can beused with the present invention system; and

FIG. 17 illustrates a schematic/flow diagram of another embodiment forthe present invention system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As seen best in FIG. 1 a solar air-conditioning system is illustratedand generally referenced as system 10. System 10 includes one or moresolar concentrators 20 and preferably a plurality of concentrators 20preferably arranged in a parallel configuration or communication witheach other. Concentrator(s) 20 capture energy from the sun raising thetemperature and pressure of the refrigerant within the pipe, tubing,plumbing, conduits, hoses, etc. (all collectively referred to as “pipe”or “piping”) at the focal point. Though not considered limiting, therefrigerant can be Freon or ammonia gas. All of the pipe, valves,components, etc. of the present invention are preferably connected toeach other through conventional connectors, fasteners, etc.

The refrigerant within the pipe proceeds or otherwise travels to the oneor more heat dissipaters, commonly known as condensers 30, which can belarge area condensers. The number of condensers 30 can correspond to thenumber of concentrators provided for system 10. Condensers 30 dissipateheat from the heated refrigerant to the atmosphere. In one embodiment,condenser 30 can be approximately the size of its correspondingconcentrator 20 in length and width and affixed to concentrator 20 witha spacing measurement between concentrator 20 and condenser 30preferably within twelve (12″) inches of each other. However suchspacing measurement is not considered limited to within twelve (12″)inches and other values can be used and are considered within the scopeof the invention.

In an alternative embodiment, condenser 30 can be a single stand aloneunit, which can include an electrically driven fan similar toconventional condensers. Thus, FIG. 1 illustrates multiple condensers,whereas FIG. 3 illustrates a single condenser coil 260.

After leaving condenser(s) 30, the refrigerant proceeds through a onedirection valve 40. In a preferred embodiment, the one direction valvecan be a “high side” positive displacement one direction rotary valve.Valve 40 assures that the refrigerant proceeds in the proper directionthrough the refrigerant circuit. As shown in FIG. 1, in one embodiment,a plurality of vanes are provided within the valve housing, which aremoved by the circulating refrigerant (a portion of the refrigerantwithin the valve is shown in shading/hatched lines between two of thevanes). Valve 40 can also provide a mechanical link 60 to the energyproduced by the moving refrigerant. The mechanical link can be used todrive a generator, water circulation pump and/or other device.

From valve 40, the refrigerant travels to an evaporator 80 which ispreferably fitted with an expansion valve 90. In the preferredembodiment, expansion valve 90 can be an electronically controlledvalve, though such is not considered limiting. FIGS. 5 through 7provides further details on various non-limiting expansion valveembodiments that can be used with the present invention system orcircuit.

Valve 90 is controlled based on the pressures contained within therefrigerant circuit which can vary as the solar energy varies. Theexpanding refrigerant within evaporator 80 removes the heat from thecoil and medium surrounding evaporator 80. Preferably, evaporator 80 canbe disposed within a water tank 100. Water tank 100 is preferably largeenough in size to hold a large amount of a liquid, such as, but notlimited to, approximately two thousand (2000) gallons of the liquid.However, other size water tanks can be used and are considered withinthe scope of the invention.

Preferably, the liquid 106 contained within water tank 100 can be amixture of water and anti-freeze. Preferably, water tank 100 can beinsulated, such as, but not limited to, burying water tank 100 beneathground level. Additionally, water tank 100 can be greater in height thanwidth to operate co-operatively with temperature stratification. Assuch, heat can be removed from many gallons of water, which anon-limiting example is shown by the following factoid using anon-limiting 2000 gallon water tank 100:

British Thermal Unit (‘BTU’). 1 BTU=1 pound of water 1° F.

Water=8 pounds per gallon; 1 cubic foot=7.48 gallons=60 pounds of water.

134 cubic feet—8018 pounds of water.

Non-limiting Tank 100 dimensions: 4.2 ft×8 ft×8 ft=269 cu. ft=2000gallons

2000 gallons=16,000 pounds=16,000 BTU per degree Fahrenheit.

32° F. to 12° F.=20° F.

20° F.×16,000 BTU=320,000 BTU

320,000 BTU/20,000 BTU hour=16 hours reserve.

Solar Power:

200 BTU/square foot/hour around solar noon.

20,000 BTU's per 100 square feet

40,000 BTU's per 200 square feet

Non-limiting Solar Concentrator 20 dimensions: each 2 ft.×10 ft.=20square ft

10 units=200 square ft=40,000 BTU/hour

The refrigerant exits from evaporator 80 and is directed to a second onedirectional valve 110, which again can be a positive displacement onedirection rotary valve. Valve 110 can have a larger positivedisplacement chamber as compared to valve 40 since it may be workingwith lower pressures, and thus in the preferred embodiment, can beconsidered a low pressure valve. Valve 110 can also have a mechanicallink 62 and can be (though not required) mechanically linked with valve40, as illustrated in FIG. 1. By linking valves 40 and 110 together,stability can be provided to the refrigerant circuit. Furthermore, therotation of valves 40 and 110 can derive rotational mechanical energywhich can be utilized to drive a generator, water circulation pump, etc.and is illustrated with a generator or water pump 112. The vanes ofvalves 40 and 110 can be spring loaded.

The refrigerant then is directed from valve 110 to a preferably commonlyconnected balancing valve 120 and/or as an inlet to compressor 140.System balancing valve 120 can have a first inlet valve 122 which canconstitute the primary circuit for the refrigerant and a second inletvalve 124 which is in communication with the outlet of compressor 140.Refrigerant travels through balancing valve 120 to one direction orone-way valve 150 where it proceeds to solar concentrator(s) 20 torestart the cycle.

Compressor 140 can be driven by a conventional compressor motor 144.Thus, when there is insufficient solar energy (cloudy day, etc.), system10 (such as through one or more sensors provided in the circuit) cansense or otherwise determine to activate motor 144 to electrically drivecompressor 140. In one non-limiting example, a temperature sensor can bedisposed within the water tank for determining when to turn motor 144on. Additionally, pressure sensors or other devices can also be used forthis purpose. Pressurized refrigerant from compressor 140 can proceedthrough second inlet valve 124 on the balancing valve to one directionvalve 150. Where a temperature sensor is provided within water tank 100,compressor 140 can be activated at predetermine temperatures through itsconnection to a conventional switcher (not shown in FIG. 1 but can besimilar to the switch control shown in FIG. 2). In one non-limitingexample, the predetermined temperature can be anywhere in the range ofabout 32° F. to about 12° F. However, other temperature values can beused and are considered within the scope of the invention.

The present invention can store air conditioning energy in the form ofchilled water, which can be below the freezing point of 32° F., andpreferably within the temperature range of 32° F. to 12° F. or about 32°F. to about 12° F. However, the present invention is not limited to thisspecific range and other ranges can be chosen and are within the scopeof the invention.

Balancing valve 120 can be constructed such that there is linkagebetween first inlet valve 122 and second inlet valve 124. Thus, firstinlet valve 122 can be closed, when the force of the pressurizedrefrigerant from compressor 140 opens second inlet valve 124. Similarly,when first inlet valve 122 is opened through receipt of refrigerant fromvalve 110, second inlet valve 124 can be closed. It is also possible andwithin the scope of the invention that both first inlet valve 122 andsecond inlet valve 124 are partially opened at the same time and therefrigerant traveling through both inlet valves (122 and 124) merges orcombines and enters a single outlet which serves as the inlet to one wayvalve 150.

As seen in FIG. 1, water tank 100 also contains a pickup radiator 180acting as heat exchange coil which functions as part of a separatechilled (or heated) water system 175 of air-conditioning (heat) forwithdrawing (or adding) heat from (or to) a dwelling or structurethrough one or more radiators 190. Pickup radiator 180 in water tank 100and one more radiators 190 disposed throughout the dwelling cancirculate anti-freeze/water by way of a pump 196, which can beelectrically or mechanically driven. The circulation of the water allowsheat to be removed from or added to (as desired) from the dwelling. Thechilled (heated) liquid or water system in the preferred embodiment isseparate and isolated from the storage medium liquid or water. Oneskilled in the art would include a control, such as a thermostaticcontrol, at each dwelling coil controlling the cold water flow such thatthe freezing point is not attained in these coils.

The present invention system can also be converted or otherwise switchfrom solar air conditioner to solar heating. As seen in FIG. 2, system250, which can contain similar not shown components as system 10, wherea stand-alone (single) condenser 260 (FIG. 3) is used a bypass valve 270(with associated pipe) can be provided at condenser 260. It should berecognized that multiple condensers, such as shown in FIG. 1, can alsobe used and each condenser can be provided with a bypass valve andassociated pipe. By opening or otherwise engaging bypass valve 270 andelectrically withdrawing the controlling element of the electronicexpansion valve 90, the solar heated refrigerant is allowed to circulatethrough evaporator 80, which heats the water or mixture in water tank100 by conduction. Generator 190, which can be commonly connected torotary valves 40 and/or 110 can be electrically switched to function asa motor. The motor can drive rotary valves 40 and/or 110 to assurecirculation of the heated refrigerant through the refrigerant circuit.

Bypass valve 270 is shown in more detail in FIG. 4. A housing 271 withinlet port 273 and outlet port 275 is shown. Actuator solenoid 277controlling a piston 279 dictates the travel route of the refrigerant byopening or closing appropriate ports depending if the system is beingused for air conditioning or for heating purposes. However, other typesof bypass valves can be used with the present invention system orcircuit and are also considered within the scope of the invention.

As the heat of the refrigerant has not been dissipated through acondenser, the refrigerant warms water or mixture in tank 100, which inturn causes the liquid/water in pickup radiator 180 to be heated andthen dispersed through system 175 by pump 196 as described above.

As seen in FIG. 2, the present invention system can also be complementedwith solar electric panels 300 and battery 320. Electricity derived fromthis sub-system can drive compressor 140. The energy fromconcentrator(s) 20 and the solar electric can compliment each other todrive the refrigerant within the circuit. Additionally, at times ofinsufficient solar energy or battery energy, power from a utility grid370 can supply the energy to drive compressor 140. A switching control324 can be provided for managing or controlling the various energysources. Thus, the various components help to drive compressor 140 whenneeded, which can be considered, though not required, a supplement modeof energy.

It should be recognized that various combinations of concentrator(s),battery(ies), utility grid (conventional electricity), solar panel(s),etc. can be used and all combinations are considered within the scope ofthe invention. Thus, as non-limiting examples, the complimentary systemdoes not necessarily preclude (1) a system which operates solely onenergy from solar concentrators, excluding solar electric; or (2) asystem which operates solely on solar electric panels, excluding solarconcentrators. Again, the above-described energy sources can be used invarious combinations or by themselves and all variations are consideredwithin the scope of the invention.

FIGS. 5 through 7 illustrate several embodiments for the expansion valvecomponent of the present invention. The primary function of theexpansion valve is to meter pressurized gas (high side) into theevaporator (low side) allowing expansion of the gas and correspondingheat absorption. Conventional expansion valves operate with a constantknown pressure. However, with the present invention system it ispreferred that the expansion valve operate over a range of pressures assolar energy will vary. Thus, different types of novel designs for theexpansion valve can be used and incorporated into the present inventionsystem where the expansion valve can be controlled according topressures on the high side and on the low side within the refrigerantcircuit.

As seen in FIG. 5, an expansion valve 110 is shown and can be controlledby sensing refrigerant which has been compressed to a liquid state, andacting at that point to control the expansion valve to open slightly toallow a greater flow and thus reducing the pressure in the evaporator.

As seen in FIG. 6, an expansion valve 200 is shown and can have apressure sensing diaphragm 202 connected to a control element 203 ofexpansion valve 200. The active chamber of the diaphragm 202 can beconnected to evaporator 80, such as, but not limited to, through asuitable conduit (i.e. pipe 204). Diaphragm 202 can be connected tocontrol element 203 through a leverage bar 205 and a spring 206. Spring206 has increasing tension with compression. In operation, as gaspressure in the high side 207 of the refrigerant circuit rises, valvecontrol element 203 is raised and thus overcoming the spring tension andallowing passage of the refrigerant. As pressures begin to rise in theevaporator, diaphragm 202 moves to close control element 203 and thusblocks or limits passage of the refrigerant. As such, control element203 meters the flow of gas according to the pressure in the evaporator.With even higher pressures diaphragm 202 limit will be reached andspring tension will maintain the restrictive pressure on valve controlelement 203. Spring 206 can be gradually increasing pressure withcompression.

As seen in FIG. 7, an expansion valve 350 is shown and controls itscontrol element 203 through the use of an electrically drive linearmotor 301. Control of valve element 203 is again according to pressureswithin the refrigerant circuit and particularly on the high side beforeexpansion valve 300 and after the valve within evaporator 80. Valve 300can include an electrical potentiometer combined with a mechanicalpressure sensor and is shown in FIG. 7 as a pressure diaphragm 302 withassociated potentiometer 303. As the circuit of FIG. 7 reacts tochanging pressure the wiper/arrow moves along the resistive element ofthe potentiometer to vary the resistance.

Though in the preferred embodiment the chilled water system can be anisolated closed system with a pickup coil in the water tank, such is notconsidered limiting. It is also within the scope of the invention tohave the present invention operate with no pickup coil within the tank.Such an alternative version could operate circulating the storage mediumwater within the water through the in-dwelling radiators.

FIGS. 10 and 11 illustrates a rotary valve 400 that can be used with thepresent invention system as such as valve 40 and/or valve 110 shown inFIG. 1. Valve 400 comprises an outer cylindrical valve body housing 402having an inlet port 404 and an outlet port 406. Preferably, outlet port406 can be preferably at least one-hundred (100°) degrees in directionof rotation from inlet port 404 in a four (4) vane configuration andcorrespondingly so with multiple vanes. An inner rotational cylinder 420is disposed within housing 402 and can be supported by a centerlongitudinal shaft 422 offset from the center of outer housing 402. Aplurality of vanes 424 (preferably spring loaded) are fitted intocylinder 420. Vanes 424 are disposed along the longitudinal axis ofcylinder 420 and preferably equally spaced from each other around thecircumference of cylinder 420. As seen in the FIG. 10, inner cylindersupport shaft 422 can extend beyond valve housing 402 such that externalappliances can be attached thereto. A portion of cylinder 420 is flushagainst the inner wall of housing 402 such that vane 424 a is fullycompressed. As a gap is created between the portion of cylinder 420associated with vane 424 b and housing 402, vane 424 b protrudes outwardfrom cylinder 420, in view of its preferred spring loaded configuration.

Fundamental to the “refrigeration” or “heat pump” cycle is a dissipationof the heat of compression. This is usually accomplished by circulatingthe compressed refrigerant gas through a finned coil exposed to theatmosphere (i.e. a condenser coil). It may be a large area condenser todissipate heat by simple conduction (FIG. 1, #30) or it may be smallerand compact with fan forced air circulation (FIG. 3).

Another embodiment or method that can be used with the present inventionsystem is illustrated in FIG. 8. In this method, condenser coil 30 maydissipate heat to water circulated over its surface. The water can bedrawn by a pump from an underground water table. The underground watertemperature can be approximately twenty-five (25° F.) degrees Fahrenheitcooler than the atmosphere. Other degree differences can also beselected and are considered within the scope of the invention. Thus, theefficiency of the heat dissipation and of the overall cooling isenhanced. This method might circulate water from the water table.Alternatively, water can be sprayed as a mist onto the condenser in itsown external evaporation cycle of liquid to gas.

It should be recognized that other concentrators can be used with thepresent invention system and all are considered within the scope of theinvention. Certain examples of concentrators are generally shown in theFigures but are not considered to limit the types of concentrators thatcan be used and incorporated into the present invention system.

FIG. 12 is a perspective view of a dish concentrator 500 that can beused with the present invention system. FIG. 13 is a partial cutawayperspective view of a ceramic coil pickup unit 502 of dish concentrator500 illustrating the internal ceramic spiral coil. FIG. 14 is aperspective view of a solar receiver and heat-engine housingcollectively referenced at numeral 520. FIG. 15 illustrated a parabolictrough concentrator 530 and FIG. 16 illustrates a Fresnel lensconcentrator 540.

The above-described and illustrated rotary positive displacement valvesprovide a unique valve design which can be advantageously optimized forthe instant invention system. The movement under pressure of a gas orliquid, such as, but not limited to, a refrigerant in liquid or gasform, causes the rotation of the valve. Preferably composed of fourchambers in a four vane version, each vane chamber successively isfilled and caused to rotate by the high side pressure on that chambervane. The chamber is then closed by the following vane and finallyemptied as such chamber is decreased in volume due to the preferredoffset center, the point of co-incidence of the inner cylinder rotor andthe vane and placement of the exit port. The valves of the presentinvention are driven by the pressure of the heated gas. Preferably, twovalves are connected together, with the high side and the low side allgiven stability to the refrigerant movement through the circuit. Insolar heat mode, the valves may be motor driven to promote circulationof the heated refrigerant. The valves do not compress in either thesolar air conditioning mode or the solar heat mode.

Thus in one embodiment, a rotational multi-vane positive displacementvalve is disclosed which can comprise: an outer cylindrical valve bodyhousing having an inlet port and an outlet port and an inner rotationalcylinder disposed within the outer cylindrical valve body housing andsupported by a longitudinal shaft offset from a center position of theouter housing. The inner rotational cylinder can have a plurality ofspring loaded vanes along a substantial portion of its longitudinal axisthat are preferably equally spaced around a circumference of the innerrotational cylinder. The outlet port can be located at least 100 degreesin direction of rotation from the inlet port, when the inner cylinderhas four vanes. The shaft preferably extends beyond the outer valvehousing and can be adapted for attachment to external appliances.

Thus, summarizing the present invention provides a solarair-conditioning system that is preferably designed to operate withconcentrated solar heat and uses a circulating refrigerant in a cycle ofcompression and expansion. Solar concentrators raise the temperature andpressure of the refrigerant. The raised temperature is dissipated to theatmosphere and the refrigerant proceeds to the evaporator coil, which islocated within a water tank containing at least 1000 gallons of ananti-freeze water solution. As the water is the storage medium, heat canbe added to or extracted from the storage medium by the evaporator coil.A radiator pickup coil is also located within the water tank and is partof a separate chilled water system which can circulate its own watersupply through other radiators located throughout a dwelling.Additionally, one or more bypass valve(s) within the refrigerant systemallow switching to solar heating.

The above-described systems of the present invention can also be usedfor or applicable to large area coolers or refrigerators and provides adevice which can provide refrigeration to areas where electricity is notpresent or available.

While the invention has been described and disclosed in certain termsand has disclosed certain embodiments or modifications, persons skilledin the art who have acquainted themselves with the invention, willappreciate that it is not necessarily limited by such terms, nor to thespecific embodiments and modifications disclosed herein. Thus, a widevariety of alternatives, suggested by the teachings herein, can bepracticed without departing from the spirit of the invention, and rightsto such alternatives are particularly reserved and considered within thescope of the invention.

1. A water tank for use in air-conditioning or heating system, comprising: a container storing at least one thousand gallons of a fluid; an evaporator coil disposed within the container and fluid, said evaporator consisting as part of a refrigerant circuit; and a pickup radiator coil disposed within the container and fluid, said pickup radiator coil consisting as part of a chilled water air conditioning water system for a dwelling.
 2. The water tank of claim 1 wherein said container is insulated.
 3. The water tank of claim 1 wherein said fluid stored within said container is a mixture of water and anti-freeze.
 4. The water tank of claim 2, wherein said container is insulated by burying the container beneath ground level.
 5. The water tank of claim 1 wherein said container is greater in height than width.
 6. The water tank of claim 1 wherein said container storing about 2000 gallons of fluid.
 7. A water tank for use in air-conditioning or heating system, comprising: an insulated container storing at least one thousand gallons of a fluid comprised of a mixture of water and anti-freeze, said container greater in height than width; an evaporator coil disposed within the container and fluid, said evaporator consisting as part of a refrigerant circuit; and a pickup radiator coil disposed within the container and fluid, said pickup radiator coil consisting as part of a chilled water air conditioning water system for a dwelling.
 8. The water tank of claim 7, wherein said container is insulated by burying the container beneath ground level.
 9. The water tank of claim 1 wherein said container storing about 2000 gallons of the fluid.
 10. A water tank for use in air-conditioning or heating system, comprising: a container storing about two thousand gallons of a fluid comprised of a mixture of water and anti-freeze, said container greater in height than width, said container buried beneath ground level for insulating purposes; an evaporator coil disposed within the container and fluid, said evaporator consisting as part of a refrigerant circuit; and a pickup radiator coil disposed within the container and fluid, said pickup radiator coil consisting as part of a chilled water air conditioning water system for a dwelling. 